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docs: create BOM md

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Gustavo Alberto 2025-10-07 19:02:15 -03:00
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# Bill of Materials (BOM)
## Mechanics
| Name | Qty | Description | Comments | Suggested link |
|------|-----|--------------|-----------|----------------|
| Steel ball | 12 | Ø1.25 mm (0.05") | Precision G10 or better. Can be sourced from small ball bearings | |
| PU stretch cord | 1 m | Ø1mm | e.g. "Stretch Magic" or "Magic String" | |
| Neodym Cylinder Magnet | 70 | Ø3mm h=4 mm | | |
| Brass Pipe | 1 m | OD=Ø2mm ID=Ø1 mm | | |
| M2 Screw | 12 | M2×12 mm, Countersunk | | |
| M3 Grub Screw | 6 | M3×4 | | |
## Electronics
| Name | Qty | Description | Comments | Suggested link |
|------|-----|--------------|-----------|----------------|
| DC-DC Step Down Module | 1 | 4.75–23 V Step-Down Buck Converter | | |
| (1N5819) OR (PMEG4010) | 1 | Diode (through-hole or SMD) | | |
| Raspberry Pi Pico 2 | 1 | Microcontroller board | | |
| MT6835 Magnetic Encoder Module | 3 | Magnetic encoder | | |
| TB6612FNG Driver | 3 | | | |
| 470 µF Electrolytic Capacitor | 3 | > 100 µF | anything > 100µF will work well | |
| 10 µF Ceramic Capacitor 0603 | 3 | Optional | | |
| 4.7 k Resistor 0603 | 2 | Optional | | |
| 2 Pin Power Header | 1 | 7.5 mm pitch | | |
| 4 Pin Header | 4 | 2.5 mm pitch | | |
| 8 Pin Header | 1 | 2.0 mm pitch | | |
| NEMA 17 Stepper Motor | 3 | Body ≤ 38 mm | Body length <= 38mm | |
## 3D Printing
| Name | Qty | Description | Comments | Suggested link |
|------|-----|--------------|-----------|----------------|
| WireFlexureMount | 3 | | 0.4 mm+ nozzle may require post-processing | |
| RubberBandCollet | 3 | | 0.4 mm+ nozzle may require post-processing | |
| BallJointMount | 3 | | 0.4 mm+ nozzle may require post-processing | |
| Motor Mount | 3 | | | |
| End Effector | 1 | | | |
| Base Block | 1 | | | |